These are some of my custom made 416 Rigby loads. Speer 350 grain Mag Tip with 100 grains Hodgdon- 4350. Hornady 400 grain Round Nose with 93 grains Accurate Arms 3100. Barnes 300 grain XFB with 105.5 grains Hodgdon- 4350. All of these loads produce over 5000 foot pounds of muzzle energy using a 26” barrel. As you can see, the 416 Rigby is a very large cartridge.